On the Island

Day 44 (Season 1)

The Blonde casualty was first seen when Danielle Rousseau came the the survivors beach camp to warn the survivors that "The Others are coming". ("Exodus, Part 1")

Days 48-67 (Season 2)

A week later the Blonde casualty welcomed back Jin, Libby, and Bernard when they returned from their trek across the Island. The next day she attended Shannon's funeral. When Charlie started a fire near the survivors' camp, she along with others, tried to put it out. The next day, she listened to Sawyer's speech about how he conned the whole group. ("Collision")("The Long Con")

A few days later the Blonde casualty watched in amusement as Jack beat Sawyer in a game of poker. She also listened to Bernard's speech about making a SOS sign however, she opted not to participate in the construction of the sign. On Day 66 she attended the funeral of Ana Lucia and Libby and witnessed Desmond returning on his sailboat. ("Lockdown") ("S.O.S.") ("Live Together, Die Alone, Part 1")

Days 91-97 (Season 4)

Blonde casualty celebrated with her fellow survivors as they awaited rescue. The survivors made their way to the cockpit, where they were intercepted by Locke. He attempted to convince the survivors to join him in his journey to the barracks. Blonde casualty chose to join Locke's survivor faction and go to the Barracks, one of four extras to do so. The next day as she walked with Locke's group to the Barracks, she was one of the first to discover Charlotte Lewis in a small river. ("The Beginning of the End")("Confirmed Dead")

When the mercenary team invaded the Barracks, Blonde casualty ran out of her house after Doug was shot while collecting firewood. Sawyer warned her to return inside, but before she could respond, she was also shot in the chest and killed. Incidentally, this killing gave her character "redshirt" status. Her death prompted Jerome to come out of the house as well, whereupon he was also shot and killed. The fate of the fourth extra shown to join Locke's faction was not depicted in the episode. ("The Shape of Things to Come")

Trivia

When Hurley won the lottery, the Blonde casualty was among the reporters who interviewed him. This appearance may simply be a re-use among extras, not intended by the writers to be the same "character" as the Flight 815 survivor. ("Numbers")

Beside portraying a reporter and a blonde survivor of flight 815, Pamela Larson had also portrayed a guest at Jack's wedding in "Do No Harm". It's unknown if the guest and the blonde survivor were meant to be the same character.